Staff Sgt. Nathan Dunn marshals a High Mobility Multipurpose Wheeled Vehicle, or HMMWV, into a C-17 Globemaster III at Charleston Air Force Base, S.C., on Aug. 24, 2009. The loading of the HMMVV marked Sergeant Dunn's 500th cargo load. Sergeant Dunn is an aerial port expeditor with the 437th Aerial Port Squadron. (U.S. Air Force Photo/James M. Bowman)